Potassium hexanitritocobaltate(III)

Potassium cobaltinitrite
Names
	IUPAC name Potassium hexanitritocobaltate(III)
	Other names Potassium cobaltinitrite
Identifiers
CAS Number	13782-01-9 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.034.018
PubChem CID	25022080;
UNII	40W79B48SV ;
CompTox Dashboard (EPA)	DTXSID60929905 ;
	InChI InChI=1S/Co.3K.6HNO2.H2O/c;;;;62-1-3;/h;;;;6(H,2,3);1H2/q+3;3*+1;;;;;;;/p-6;
	SMILES N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].[K+].[K+].[K+].[Co];
Properties
Chemical formula	K3[Co(NO2)6] (anhydrous); K3[Co(NO2)6]·1.5H2O (sesquihydrate)
Molar mass	452.26 g/mol (anhydrous); 479.284 g/mol (sesquihydrate)
Appearance	yellow cubic crystals (sesquihydrate)
Density	2.6 g/cm3 (sesquihydrate)
Solubility in water	slightly soluble in water (sesquihydrate)
Solubility	reacts with acids, insoluble in ethanol (sesquihydrate)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Potassium hexanitritocobaltate(III) is a salt with the formula K₃[Co(NO₂)₆]. It is a yellow solid that is poorly soluble in water. The compound finds some use as a yellow pigment under the name Indian Yellow.

The salt features potassium cations and an trianionic coordination complex. In the anion, cobalt is bound by six nitrito ligands, the overall complex having octahedral molecular geometry. The oxidation state of cobalt is 3+. Its low-spin d⁶ configuration confers kinetic stability and diamagnetism. The compound is prepared by combining cobalt(II) and nitrite salts in the presence of oxygen. The corresponding sodium cobaltinitrite is significantly more soluble in water.^[2]

The compound was first described in 1848 by Nikolaus Wolfgang Fischer in Breslau,^[3] and it is used as a yellow pigment called Aureolin.^[4]^[5]

References

^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–54. ISBN 0-8493-0594-2.
^ O. Glemser (1963). "Sodium Hexanitritocobaltate (III)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 1541.
^ Fischer, N. W. (1848). "Ueber die salpetrichtsauren Salze". Annalen der Physik und Chemie. 150 (5): 115–125. Bibcode:1848AnP...150..115F. doi:10.1002/andp.18491500512.
^ Gates, G. (1995). "A Note on the Artists' Pigment Aureolin". Studies in Conservation. 40 (3): 201–206. doi:10.2307/1506479. JSTOR 1506479.
^ Gettens, Rutherford John; Stout, George Leslie (1966). Painting materials: A short encyclopaedia. Courier Corporation. pp. 109–110. ISBN 978-0-486-21597-6.

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[hand-1] Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–54. ISBN 0-8493-0594-2.

[2] O. Glemser (1963). "Sodium Hexanitritocobaltate (III)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 1541.

[3] Fischer, N. W. (1848). "Ueber die salpetrichtsauren Salze". Annalen der Physik und Chemie. 150 (5): 115–125. Bibcode:1848AnP...150..115F. doi:10.1002/andp.18491500512.

[Gates-4] Gates, G. (1995). "A Note on the Artists' Pigment Aureolin". Studies in Conservation. 40 (3): 201–206. doi:10.2307/1506479. JSTOR 1506479.

[Getts-5] Gettens, Rutherford John; Stout, George Leslie (1966). Painting materials: A short encyclopaedia. Courier Corporation. pp. 109–110. ISBN 978-0-486-21597-6.

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Potassium hexanitritocobaltate(III)

See also

References